| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for preparing an expandable novolak type phenol resin composition by mixing a novolak type phenol resin with a foam stabilizer and hexamethylenetetramine as a curing agent without using a blowing agent. SOLUTION: This expandable novolak type phenol resin composition is prepared by mixing a novolak type phenol resin, obtained by reacting phenols with aldehydes in the presence of an acid catalyst, with a foam stabilizer and hexamethylenetetramine as a curing agent, and is equal to a composition prepared by using a conventional blowing agent in expandability and performances of an expanded body obtained.
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